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/* $OpenBSD: xmalloc.c,v 1.8 2007/02/22 06:42:10 otto Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
* Versions of malloc and friends that check their results, and never return
* failure (they call fatal if they encounter an error).
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*/
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "log.h"
#include "xmalloc.h"
void *
xmalloc(size_t size)
{
void *ptr;
if (size == 0)
fatal("xmalloc: zero size");
ptr = malloc(size);
if (ptr == NULL)
fatal("xmalloc: out of memory (allocating %lu bytes)", (u_long) size);
return ptr;
}
void *
xcalloc(size_t nmemb, size_t size)
{
void *ptr;
if (size == 0 || nmemb == 0)
fatal("xcalloc: zero size");
if (SIZE_T_MAX / nmemb < size)
fatal("xcalloc: nmemb * size > SIZE_T_MAX");
ptr = calloc(nmemb, size);
if (ptr == NULL)
fatal("xcalloc: out of memory (allocating %lu bytes)",
(u_long)(size * nmemb));
return ptr;
}
void *
xrealloc(void *ptr, size_t nmemb, size_t size)
{
void *new_ptr;
size_t new_size = nmemb * size;
if (new_size == 0)
fatal("xrealloc: zero size");
if (SIZE_T_MAX / nmemb < size)
fatal("xrealloc: nmemb * size > SIZE_T_MAX");
if (ptr == NULL)
new_ptr = malloc(new_size);
else
new_ptr = realloc(ptr, new_size);
if (new_ptr == NULL)
fatal("xrealloc: out of memory (new_size %lu bytes)",
(u_long) new_size);
return new_ptr;
}
void
xfree(void *ptr)
{
if (ptr == NULL)
fatal("xfree: NULL pointer given as argument");
free(ptr);
}
char *
xstrdup(const char *str)
{
size_t len;
char *cp;
len = strlen(str) + 1;
cp = xmalloc(len);
strlcpy(cp, str, len);
return cp;
}
int
xasprintf(char **ret, const char *fmt, ...)
{
va_list ap;
int i;
va_start(ap, fmt);
i = vasprintf(ret, fmt, ap);
va_end(ap);
if (i < 0 || *ret == NULL)
fatal("xasprintf: could not allocate memory");
return (i);
}
int
xsnprintf(char *str, size_t size, const char *fmt, ...)
{
va_list ap;
int i;
va_start(ap, fmt);
i = vsnprintf(str, size, fmt, ap);
va_end(ap);
if (i == -1 || i >= (int)size)
fatal("xsnprintf: overflow");
return (i);
}
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